Cuprates phase diagram deduced from magnetic susceptibility: What is the ‘true’ pseudogap line?

Two contradictory phase diagrams have dominated the literature of high-Tc cuprate superconductors. Does pseudogap line cross superconducting Tc-dome or not? To answer, we revisited experimental magnetic susceptibility and knight shift four different compounds, La1−xSrxCuO4, Bi2Sr2Ca1−xYxCu2O8, Bi2Sr2CaCu2O8+y, YBa2Cu3O6+y, as a function temperature doping. The can be described by same for all materials, having an electronic contributions. former is 2D antiferromagnetic (AF) square lattice response, with characteristic correlations Tmax. latter ‘Pauli’ term, revealing gap opening in density states at T∗. From precise fits data, find that Tmax(p) decreases linearly doping (p) over wide range, but saturates abruptly overdoped regime. Concomitantly, T∗(p) linear tangent to dome, either crossing approaching top indicating qualitative change behavior from underdoped regimes. Contrary idea terminates just above optimal doping, our analysis suggests exists throughout diagram. It consistent due hole pairs, ‘pairons’, Tc. We conclude Tmax, reflecting AF correlations, has often been misinterpreted